Backpack



FIG. 1 is a right side front perspective view of the backpack showing mynew design;

FIG. 2 is a left side rear perspective view thereof;

FIG. 3 is a front elevational view thereof; and

FIG. 4 is a rear elevational view thereof.

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines showing stitching form no part of the claimed design.All other broken lines show portions of the backpack that form no partof the claimed design.

CLAIM The ornamental design for a backpack, as shown and described. 